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» Revision
237.7.28
(compared to revision 237.3.2)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2011-03-21 19:22:27 UTC
- mto: (24.1.171 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 284.
- Revision ID: teddy@fukt.bsnet.se-20110321192227-y74ngvvcy9eq6shi
* plugins.d/mandos-client.c (good_interface): Check if the interface
name starts with "."
before anything else.
Bug fix: Fix memory
leak.
name starts with "."
before anything else.
Bug fix: Fix memory
leak.
- files added:
- DBUS-API
- debian/source
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror() */
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
48
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
53
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
52
56
#include <sys/stat.h> /* open() */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
55
connect() */
58
inet_pton(), connect() */
56
59
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
64
#include <assert.h> /* assert() */
60
65
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time(), sleep() */
62
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
63
68
SIOCSIFFLAGS, if_indextoname(),
64
69
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
66
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
getuid(), getgid(), setuid(),
68
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
69
76
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
71
78
#include <argp.h> /* struct argp_option, error_t, struct
72
79
argp_state, struct argp,
73
80
argp_parse(), ARGP_KEY_ARG,
74
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
75
91
76
92
/* Avahi */
77
93
/* All Avahi types, constants and functions
90
106
gnutls_*
91
107
init_gnutls_session(),
92
108
GNUTLS_* */
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
94
111
GNUTLS_OPENPGP_FMT_BASE64 */
95
112
96
113
/* GPGME */
110
127
static const char mandos_protocol_version[] = "1";
111
128
const char *argp_program_version = "mandos-client " VERSION;
112
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
113
132
114
133
/* Used for passing in values through the Avahi callback functions */
115
134
typedef struct {
122
141
gpgme_ctx_t ctx;
123
142
} mandos_context;
124
143
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
125
152
/*
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
128
155
* "buffer_length" is how much is already used.
129
156
*/
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
157
size_t incbuffer(char **buffer, size_t buffer_length,
131
158
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
133
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
134
if (buffer == NULL){
161
if(buffer == NULL){
135
162
return 0;
136
163
}
137
164
buffer_capacity += BUFFER_SIZE;
142
169
/*
143
170
* Initialize GPGME.
144
171
*/
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
172
static bool init_gpgme(const char *seckey,
146
173
const char *pubkey, const char *tempdir){
147
int ret;
148
174
gpgme_error_t rc;
149
175
gpgme_engine_info_t engine_info;
150
176
151
177
152
178
/*
153
* Helper function to insert pub and seckey to the enigne keyring.
179
* Helper function to insert pub and seckey to the engine keyring.
154
180
*/
155
181
bool import_key(const char *filename){
182
int ret;
156
183
int fd;
157
184
gpgme_data_t pgp_data;
158
185
163
190
}
164
191
165
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
193
if(rc != GPG_ERR_NO_ERROR){
167
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
195
gpgme_strsource(rc), gpgme_strerror(rc));
169
196
return false;
170
197
}
171
198
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
199
rc = gpgme_op_import(mc.ctx, pgp_data);
200
if(rc != GPG_ERR_NO_ERROR){
174
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
202
gpgme_strsource(rc), gpgme_strerror(rc));
176
203
return false;
184
211
return true;
185
212
}
186
213
187
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
214
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
189
216
}
190
217
191
218
/* Init GPGME */
192
219
gpgme_check_version(NULL);
193
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
194
if (rc != GPG_ERR_NO_ERROR){
221
if(rc != GPG_ERR_NO_ERROR){
195
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
223
gpgme_strsource(rc), gpgme_strerror(rc));
197
224
return false;
198
225
}
199
226
200
227
/* Set GPGME home directory for the OpenPGP engine only */
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
228
rc = gpgme_get_engine_info(&engine_info);
229
if(rc != GPG_ERR_NO_ERROR){
203
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
231
gpgme_strsource(rc), gpgme_strerror(rc));
205
232
return false;
218
245
}
219
246
220
247
/* Create new GPGME "context" */
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
248
rc = gpgme_new(&(mc.ctx));
249
if(rc != GPG_ERR_NO_ERROR){
223
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
251
gpgme_strsource(rc), gpgme_strerror(rc));
225
252
return false;
226
253
}
227
254
228
if (not import_key(pubkey) or not import_key(seckey)){
255
if(not import_key(pubkey) or not import_key(seckey)){
229
256
return false;
230
257
}
231
258
232
return true;
259
return true;
233
260
}
234
261
235
262
/*
236
263
* Decrypt OpenPGP data.
237
264
* Returns -1 on error
238
265
*/
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
size_t crypto_size,
268
char **plaintext){
243
269
gpgme_data_t dh_crypto, dh_plain;
244
270
gpgme_error_t rc;
245
271
ssize_t ret;
246
272
size_t plaintext_capacity = 0;
247
273
ssize_t plaintext_length = 0;
248
274
249
if (debug){
275
if(debug){
250
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
251
277
}
252
278
253
279
/* Create new GPGME data buffer from memory cryptotext */
254
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
255
281
0);
256
if (rc != GPG_ERR_NO_ERROR){
282
if(rc != GPG_ERR_NO_ERROR){
257
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
258
284
gpgme_strsource(rc), gpgme_strerror(rc));
259
285
return -1;
261
287
262
288
/* Create new empty GPGME data buffer for the plaintext */
263
289
rc = gpgme_data_new(&dh_plain);
264
if (rc != GPG_ERR_NO_ERROR){
290
if(rc != GPG_ERR_NO_ERROR){
265
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
266
292
gpgme_strsource(rc), gpgme_strerror(rc));
267
293
gpgme_data_release(dh_crypto);
270
296
271
297
/* Decrypt data from the cryptotext data buffer to the plaintext
272
298
data buffer */
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
275
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
302
gpgme_strsource(rc), gpgme_strerror(rc));
277
303
plaintext_length = -1;
278
if (debug){
304
if(debug){
279
305
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
306
result = gpgme_op_decrypt_result(mc.ctx);
307
if(result == NULL){
282
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
283
309
} else {
284
310
fprintf(stderr, "Unsupported algorithm: %s\n",
290
316
}
291
317
gpgme_recipient_t recipient;
292
318
recipient = result->recipients;
293
if(recipient){
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
300
? "No" : "Yes");
301
recipient = recipient->next;
302
}
319
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
326
recipient = recipient->next;
303
327
}
304
328
}
305
329
}
311
335
}
312
336
313
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
315
339
perror("gpgme_data_seek");
316
340
plaintext_length = -1;
317
341
goto decrypt_end;
319
343
320
344
*plaintext = NULL;
321
345
while(true){
322
plaintext_capacity = adjustbuffer(plaintext,
346
plaintext_capacity = incbuffer(plaintext,
323
347
(size_t)plaintext_length,
324
348
plaintext_capacity);
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
327
351
plaintext_length = -1;
328
352
goto decrypt_end;
329
353
}
331
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
332
356
BUFFER_SIZE);
333
357
/* Print the data, if any */
334
if (ret == 0){
358
if(ret == 0){
335
359
/* EOF */
336
360
break;
337
361
}
361
385
return plaintext_length;
362
386
}
363
387
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
367
392
ret = "(unknown)";
368
393
return ret;
369
394
}
374
399
fprintf(stderr, "GnuTLS: %s", string);
375
400
}
376
401
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
402
static int init_gnutls_global(const char *pubkeyfilename,
379
403
const char *seckeyfilename){
380
404
int ret;
381
405
384
408
}
385
409
386
410
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
390
414
return -1;
391
415
}
392
416
393
if (debug){
417
if(debug){
394
418
/* "Use a log level over 10 to enable all debugging options."
395
419
* - GnuTLS manual
396
420
*/
399
423
}
400
424
401
425
/* OpenPGP credentials */
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
426
gnutls_certificate_allocate_credentials(&mc.cred);
427
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
408
434
return -1;
409
435
}
410
436
415
441
}
416
442
417
443
ret = gnutls_certificate_set_openpgp_key_file
418
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
419
445
GNUTLS_OPENPGP_FMT_BASE64);
420
if (ret != GNUTLS_E_SUCCESS) {
446
if(ret != GNUTLS_E_SUCCESS){
421
447
fprintf(stderr,
422
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
453
}
428
454
429
455
/* GnuTLS server initialization */
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
434
460
goto globalfail;
435
461
}
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
440
466
goto globalfail;
441
467
}
442
468
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
444
470
445
471
return 0;
446
472
447
473
globalfail:
448
474
449
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
450
476
gnutls_global_deinit();
451
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
452
478
return -1;
453
479
}
454
480
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
481
static int init_gnutls_session(gnutls_session_t *session){
457
482
int ret;
458
483
/* GnuTLS session creation */
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
461
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
462
492
safer_gnutls_strerror(ret));
463
493
}
464
494
465
495
{
466
496
const char *err;
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
if(ret != GNUTLS_E_SUCCESS){
469
505
fprintf(stderr, "Syntax error at: %s\n", err);
470
506
fprintf(stderr, "GnuTLS error: %s\n",
471
507
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
508
gnutls_deinit(*session);
473
509
return -1;
474
510
}
475
511
}
476
512
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
if(ret != GNUTLS_E_SUCCESS){
480
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
523
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
524
gnutls_deinit(*session);
483
525
return -1;
484
526
}
485
527
486
528
/* ignore client certificate if any. */
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
489
530
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
491
532
492
533
return 0;
493
534
}
499
540
/* Called when a Mandos server is found */
500
541
static int start_mandos_communication(const char *ip, uint16_t port,
501
542
AvahiIfIndex if_index,
502
mandos_context *mc){
503
int ret, tcp_sd;
543
int af){
544
int ret, tcp_sd = -1;
504
545
ssize_t sret;
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
506
550
char *buffer = NULL;
507
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
508
552
size_t buffer_length = 0;
509
553
size_t buffer_capacity = 0;
510
ssize_t decrypted_buffer_size;
511
554
size_t written;
512
int retval = 0;
513
char interface[IF_NAMESIZE];
555
int retval = -1;
514
556
gnutls_session_t session;
515
516
ret = init_gnutls_session (mc, &session);
517
if (ret != 0){
557
int pf; /* Protocol family */
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
switch(af){
567
case AF_INET6:
568
pf = PF_INET6;
569
break;
570
case AF_INET:
571
pf = PF_INET;
572
break;
573
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
return -1;
577
}
578
579
ret = init_gnutls_session(&session);
580
if(ret != 0){
518
581
return -1;
519
582
}
520
583
521
584
if(debug){
522
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
523
586
"\n", ip, port);
524
587
}
525
588
526
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
527
if(tcp_sd < 0) {
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
528
592
perror("socket");
529
return -1;
593
errno = e;
594
goto mandos_end;
530
595
}
531
596
532
if(debug){
533
if(if_indextoname((unsigned int)if_index, interface) == NULL){
534
perror("if_indextoname");
535
return -1;
536
}
537
fprintf(stderr, "Binding to interface %s\n", interface);
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
538
600
}
539
601
540
602
memset(&to, 0, sizeof(to));
541
to.in6.sin6_family = AF_INET6;
542
/* It would be nice to have a way to detect if we were passed an
543
IPv4 address here. Now we assume an IPv6 address. */
544
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
545
if (ret < 0 ){
603
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
609
}
610
if(ret < 0 ){
611
int e = errno;
546
612
perror("inet_pton");
547
return -1;
613
errno = e;
614
goto mandos_end;
548
615
}
549
616
if(ret == 0){
617
int e = errno;
550
618
fprintf(stderr, "Bad address: %s\n", ip);
551
return -1;
552
}
553
to.in6.sin6_port = htons(port); /* Spurious warning */
619
errno = e;
620
goto mandos_end;
621
}
622
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
630
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
635
}
636
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
638
}
639
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
643
}
554
644
555
to.in6.sin6_scope_id = (uint32_t)if_index;
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
556
649
557
650
if(debug){
558
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
559
port);
560
char addrstr[INET6_ADDRSTRLEN] = "";
561
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
562
sizeof(addrstr)) == NULL){
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
char interface[IF_NAMESIZE];
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
655
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
658
}
659
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
662
}
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
563
674
perror("inet_ntop");
564
675
} else {
565
676
if(strcmp(addrstr, ip) != 0){
568
679
}
569
680
}
570
681
571
ret = connect(tcp_sd, &to.in, sizeof(to));
572
if (ret < 0){
573
perror("connect");
574
return -1;
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
575
704
}
576
705
577
706
const char *out = mandos_protocol_version;
578
707
written = 0;
579
while (true){
708
while(true){
580
709
size_t out_size = strlen(out);
581
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
582
711
out_size - written));
583
if (ret == -1){
712
if(ret == -1){
713
int e = errno;
584
714
perror("write");
585
retval = -1;
715
errno = e;
586
716
goto mandos_end;
587
717
}
588
718
written += (size_t)ret;
589
719
if(written < out_size){
590
720
continue;
591
721
} else {
592
if (out == mandos_protocol_version){
722
if(out == mandos_protocol_version){
593
723
written = 0;
594
724
out = "\r\n";
595
725
} else {
596
726
break;
597
727
}
598
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
599
734
}
600
735
601
736
if(debug){
602
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
603
738
}
604
739
605
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
606
607
do{
608
ret = gnutls_handshake (session);
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
753
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
609
758
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
610
759
611
if (ret != GNUTLS_E_SUCCESS){
760
if(ret != GNUTLS_E_SUCCESS){
612
761
if(debug){
613
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
614
gnutls_perror (ret);
763
gnutls_perror(ret);
615
764
}
616
retval = -1;
765
errno = EPROTO;
617
766
goto mandos_end;
618
767
}
619
768
620
769
/* Read OpenPGP packet that contains the wanted password */
621
770
622
771
if(debug){
623
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
624
773
ip);
625
774
}
626
775
627
776
while(true){
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
buffer_capacity = incbuffer(&buffer, buffer_length,
629
784
buffer_capacity);
630
if (buffer_capacity == 0){
631
perror("adjustbuffer");
632
retval = -1;
785
if(buffer_capacity == 0){
786
int e = errno;
787
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
633
794
goto mandos_end;
634
795
}
635
796
636
797
sret = gnutls_record_recv(session, buffer+buffer_length,
637
798
BUFFER_SIZE);
638
if (sret == 0){
799
if(sret == 0){
639
800
break;
640
801
}
641
if (sret < 0){
802
if(sret < 0){
642
803
switch(sret){
643
804
case GNUTLS_E_INTERRUPTED:
644
805
case GNUTLS_E_AGAIN:
645
806
break;
646
807
case GNUTLS_E_REHANDSHAKE:
647
do{
648
ret = gnutls_handshake (session);
808
do {
809
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
649
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
650
if (ret < 0){
816
if(ret < 0){
651
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
652
gnutls_perror (ret);
653
retval = -1;
818
gnutls_perror(ret);
819
errno = EPROTO;
654
820
goto mandos_end;
655
821
}
656
822
break;
657
823
default:
658
824
fprintf(stderr, "Unknown error while reading data from"
659
825
" encrypted session with Mandos server\n");
660
retval = -1;
661
gnutls_bye (session, GNUTLS_SHUT_RDWR);
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
662
828
goto mandos_end;
663
829
}
664
830
} else {
670
836
fprintf(stderr, "Closing TLS session\n");
671
837
}
672
838
673
gnutls_bye (session, GNUTLS_SHUT_RDWR);
674
675
if (buffer_length > 0){
676
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
844
do {
845
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
846
if(quit_now){
847
errno = EINTR;
848
goto mandos_end;
849
}
850
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
851
852
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
677
855
buffer_length,
678
856
&decrypted_buffer);
679
if (decrypted_buffer_size >= 0){
857
if(decrypted_buffer_size >= 0){
858
680
859
written = 0;
681
860
while(written < (size_t) decrypted_buffer_size){
682
ret = (int)fwrite (decrypted_buffer + written, 1,
683
(size_t)decrypted_buffer_size - written,
684
stdout);
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
ret = (int)fwrite(decrypted_buffer + written, 1,
867
(size_t)decrypted_buffer_size - written,
868
stdout);
685
869
if(ret == 0 and ferror(stdout)){
870
int e = errno;
686
871
if(debug){
687
872
fprintf(stderr, "Error writing encrypted data: %s\n",
688
873
strerror(errno));
689
874
}
690
retval = -1;
691
break;
875
errno = e;
876
goto mandos_end;
692
877
}
693
878
written += (size_t)ret;
694
879
}
695
free(decrypted_buffer);
696
} else {
697
retval = -1;
880
retval = 0;
698
881
}
699
} else {
700
retval = -1;
701
882
}
702
883
703
884
/* Shutdown procedure */
704
885
705
886
mandos_end:
706
free(buffer);
707
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
708
if(ret == -1){
709
perror("close");
887
{
888
int e = errno;
889
free(decrypted_buffer);
890
free(buffer);
891
if(tcp_sd >= 0){
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
893
}
894
if(ret == -1){
895
if(e == 0){
896
e = errno;
897
}
898
perror("close");
899
}
900
gnutls_deinit(session);
901
if(quit_now){
902
e = EINTR;
903
retval = -1;
904
}
905
errno = e;
710
906
}
711
gnutls_deinit (session);
712
907
return retval;
713
908
}
714
909
715
910
static void resolve_callback(AvahiSServiceResolver *r,
716
911
AvahiIfIndex interface,
717
AVAHI_GCC_UNUSED AvahiProtocol protocol,
912
AvahiProtocol proto,
718
913
AvahiResolverEvent event,
719
914
const char *name,
720
915
const char *type,
725
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
726
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
727
922
flags,
728
void* userdata) {
729
mandos_context *mc = userdata;
923
AVAHI_GCC_UNUSED void* userdata){
730
924
assert(r);
731
925
732
926
/* Called whenever a service has been resolved successfully or
733
927
timed out */
734
928
735
switch (event) {
929
if(quit_now){
930
return;
931
}
932
933
switch(event){
736
934
default:
737
935
case AVAHI_RESOLVER_FAILURE:
738
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
739
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
740
avahi_strerror(avahi_server_errno(mc->server)));
938
avahi_strerror(avahi_server_errno(mc.server)));
741
939
break;
742
940
743
941
case AVAHI_RESOLVER_FOUND:
746
944
avahi_address_snprint(ip, sizeof(ip), address);
747
945
if(debug){
748
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
749
PRIu16 ") on port %d\n", name, host_name, ip,
750
interface, port);
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
751
949
}
752
int ret = start_mandos_communication(ip, port, interface, mc);
753
if (ret == 0){
754
avahi_simple_poll_quit(mc->simple_poll);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
952
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
755
954
}
756
955
}
757
956
}
758
957
avahi_s_service_resolver_free(r);
759
958
}
760
959
761
static void browse_callback( AvahiSServiceBrowser *b,
762
AvahiIfIndex interface,
763
AvahiProtocol protocol,
764
AvahiBrowserEvent event,
765
const char *name,
766
const char *type,
767
const char *domain,
768
AVAHI_GCC_UNUSED AvahiLookupResultFlags
769
flags,
770
void* userdata) {
771
mandos_context *mc = userdata;
960
static void browse_callback(AvahiSServiceBrowser *b,
961
AvahiIfIndex interface,
962
AvahiProtocol protocol,
963
AvahiBrowserEvent event,
964
const char *name,
965
const char *type,
966
const char *domain,
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
flags,
969
AVAHI_GCC_UNUSED void* userdata){
772
970
assert(b);
773
971
774
972
/* Called whenever a new services becomes available on the LAN or
775
973
is removed from the LAN */
776
974
777
switch (event) {
975
if(quit_now){
976
return;
977
}
978
979
switch(event){
778
980
default:
779
981
case AVAHI_BROWSER_FAILURE:
780
982
781
983
fprintf(stderr, "(Avahi browser) %s\n",
782
avahi_strerror(avahi_server_errno(mc->server)));
783
avahi_simple_poll_quit(mc->simple_poll);
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
784
986
return;
785
987
786
988
case AVAHI_BROWSER_NEW:
789
991
the callback function is called the Avahi server will free the
790
992
resolver for us. */
791
993
792
if (!(avahi_s_service_resolver_new(mc->server, interface,
793
protocol, name, type, domain,
794
AVAHI_PROTO_INET6, 0,
795
resolve_callback, mc)))
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
796
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
797
name, avahi_strerror(avahi_server_errno(mc->server)));
998
name, avahi_strerror(avahi_server_errno(mc.server)));
798
999
break;
799
1000
800
1001
case AVAHI_BROWSER_REMOVE:
809
1010
}
810
1011
}
811
1012
1013
/* stop main loop after sigterm has been called */
1014
static void handle_sigterm(int sig){
1015
if(quit_now){
1016
return;
1017
}
1018
quit_now = 1;
1019
signal_received = sig;
1020
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
1024
errno = old_errno;
1025
}
1026
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
if(if_entry->d_name[0] == '.'){
1036
return 0;
1037
}
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if_entry->d_name);
1040
if(ret < 0){
1041
perror("asprintf");
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
free(flagname);
1048
return 0;
1049
}
1050
free(flagname);
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1057
perror("malloc");
1058
close(flags_fd);
1059
return 0;
1060
}
1061
while(to_read > 0){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1063
(size_t)to_read));
1064
if(ssret == -1){
1065
perror("read");
1066
free(flagstring);
1067
close(flags_fd);
1068
return 0;
1069
}
1070
to_read -= ssret;
1071
if(ssret == 0){
1072
break;
1073
}
1074
}
1075
close(flags_fd);
1076
intmax_t tmpmax;
1077
char *tmp;
1078
errno = 0;
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1083
if(debug){
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1086
}
1087
free(flagstring);
1088
return 0;
1089
}
1090
free(flagstring);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1092
/* Reject the loopback device */
1093
if(flags & IFF_LOOPBACK){
1094
if(debug){
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
if_entry->d_name);
1097
}
1098
return 0;
1099
}
1100
/* Accept point-to-point devices only if connect_to is specified */
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1102
if(debug){
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
if_entry->d_name);
1105
}
1106
return 1;
1107
}
1108
/* Otherwise, reject non-broadcast-capable devices */
1109
if(not (flags & IFF_BROADCAST)){
1110
if(debug){
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
if_entry->d_name);
1113
}
1114
return 0;
1115
}
1116
/* Accept this device */
1117
if(debug){
1118
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1119
if_entry->d_name);
1120
}
1121
return 1;
1122
}
1123
812
1124
int main(int argc, char *argv[]){
813
AvahiSServiceBrowser *sb = NULL;
814
int error;
815
int ret;
816
int exitcode = EXIT_SUCCESS;
817
const char *interface = "eth0";
818
struct ifreq network;
819
int sd;
820
uid_t uid;
821
gid_t gid;
822
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
824
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
827
828
mandos_context mc = { .simple_poll = NULL, .server = NULL,
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
833
834
{
835
struct argp_option options[] = {
836
{ .name = "debug", .key = 128,
837
.doc = "Debug mode", .group = 3 },
838
{ .name = "connect", .key = 'c',
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
841
.group = 1 },
842
{ .name = "interface", .key = 'i',
843
.arg = "NAME",
844
.doc = "Interface that will be used to search for Mandos"
845
" servers",
846
.group = 1 },
847
{ .name = "seckey", .key = 's',
848
.arg = "FILE",
849
.doc = "OpenPGP secret key file base name",
850
.group = 1 },
851
{ .name = "pubkey", .key = 'p',
852
.arg = "FILE",
853
.doc = "OpenPGP public key file base name",
854
.group = 2 },
855
{ .name = "dh-bits", .key = 129,
856
.arg = "BITS",
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
859
.group = 2 },
860
{ .name = "priority", .key = 130,
861
.arg = "STRING",
862
.doc = "GnuTLS priority string for the TLS handshake",
863
.group = 1 },
864
{ .name = NULL }
865
};
866
867
error_t parse_opt (int key, char *arg,
868
struct argp_state *state) {
869
/* Get the INPUT argument from `argp_parse', which we know is
870
a pointer to our plugin list pointer. */
871
switch (key) {
872
case 128: /* --debug */
873
debug = true;
874
break;
875
case 'c': /* --connect */
876
connect_to = arg;
877
break;
878
case 'i': /* --interface */
879
interface = arg;
880
break;
881
case 's': /* --seckey */
882
seckey = arg;
883
break;
884
case 'p': /* --pubkey */
885
pubkey = arg;
886
break;
887
case 129: /* --dh-bits */
888
errno = 0;
889
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
890
if (errno){
891
perror("strtol");
892
exit(EXIT_FAILURE);
893
}
894
break;
895
case 130: /* --priority */
896
mc.priority = arg;
897
break;
898
case ARGP_KEY_ARG:
899
argp_usage (state);
900
case ARGP_KEY_END:
901
break;
902
default:
903
return ARGP_ERR_UNKNOWN;
904
}
905
return 0;
906
}
907
908
struct argp argp = { .options = options, .parser = parse_opt,
909
.args_doc = "",
910
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
913
if (ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
920
/* If the interface is down, bring it up */
921
{
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
if(sd < 0) {
924
perror("socket");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
if(ret == -1){
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
933
goto end;
934
}
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
if(ret == -1){
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
941
goto end;
942
}
943
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
948
}
949
950
uid = getuid();
951
gid = getgid();
952
953
ret = setuid(uid);
954
if (ret == -1){
955
perror("setuid");
956
}
957
958
setgid(gid);
959
if (ret == -1){
960
perror("setgid");
961
}
962
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if (ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
984
}
985
1125
AvahiSServiceBrowser *sb = NULL;
1126
int error;
1127
int ret;
1128
intmax_t tmpmax;
1129
char *tmp;
1130
int exitcode = EXIT_SUCCESS;
1131
const char *interface = "";
1132
struct ifreq network;
1133
int sd = -1;
1134
bool take_down_interface = false;
1135
uid_t uid;
1136
gid_t gid;
1137
char tempdir[] = "/tmp/mandosXXXXXX";
1138
bool tempdir_created = false;
1139
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1140
const char *seckey = PATHDIR "/" SECKEY;
1141
const char *pubkey = PATHDIR "/" PUBKEY;
1142
1143
bool gnutls_initialized = false;
1144
bool gpgme_initialized = false;
1145
float delay = 2.5f;
1146
1147
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1148
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1149
1150
uid = getuid();
1151
gid = getgid();
1152
1153
/* Lower any group privileges we might have, just to be safe */
1154
errno = 0;
1155
ret = setgid(gid);
1156
if(ret == -1){
1157
perror("setgid");
1158
}
1159
1160
/* Lower user privileges (temporarily) */
1161
errno = 0;
1162
ret = seteuid(uid);
1163
if(ret == -1){
1164
perror("seteuid");
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
{
1172
struct argp_option options[] = {
1173
{ .name = "debug", .key = 128,
1174
.doc = "Debug mode", .group = 3 },
1175
{ .name = "connect", .key = 'c',
1176
.arg = "ADDRESS:PORT",
1177
.doc = "Connect directly to a specific Mandos server",
1178
.group = 1 },
1179
{ .name = "interface", .key = 'i',
1180
.arg = "NAME",
1181
.doc = "Network interface that will be used to search for"
1182
" Mandos servers",
1183
.group = 1 },
1184
{ .name = "seckey", .key = 's',
1185
.arg = "FILE",
1186
.doc = "OpenPGP secret key file base name",
1187
.group = 1 },
1188
{ .name = "pubkey", .key = 'p',
1189
.arg = "FILE",
1190
.doc = "OpenPGP public key file base name",
1191
.group = 2 },
1192
{ .name = "dh-bits", .key = 129,
1193
.arg = "BITS",
1194
.doc = "Bit length of the prime number used in the"
1195
" Diffie-Hellman key exchange",
1196
.group = 2 },
1197
{ .name = "priority", .key = 130,
1198
.arg = "STRING",
1199
.doc = "GnuTLS priority string for the TLS handshake",
1200
.group = 1 },
1201
{ .name = "delay", .key = 131,
1202
.arg = "SECONDS",
1203
.doc = "Maximum delay to wait for interface startup",
1204
.group = 2 },
1205
/*
1206
* These reproduce what we would get without ARGP_NO_HELP
1207
*/
1208
{ .name = "help", .key = '?',
1209
.doc = "Give this help list", .group = -1 },
1210
{ .name = "usage", .key = -3,
1211
.doc = "Give a short usage message", .group = -1 },
1212
{ .name = "version", .key = 'V',
1213
.doc = "Print program version", .group = -1 },
1214
{ .name = NULL }
1215
};
1216
1217
error_t parse_opt(int key, char *arg,
1218
struct argp_state *state){
1219
errno = 0;
1220
switch(key){
1221
case 128: /* --debug */
1222
debug = true;
1223
break;
1224
case 'c': /* --connect */
1225
connect_to = arg;
1226
break;
1227
case 'i': /* --interface */
1228
interface = arg;
1229
break;
1230
case 's': /* --seckey */
1231
seckey = arg;
1232
break;
1233
case 'p': /* --pubkey */
1234
pubkey = arg;
1235
break;
1236
case 129: /* --dh-bits */
1237
errno = 0;
1238
tmpmax = strtoimax(arg, &tmp, 10);
1239
if(errno != 0 or tmp == arg or *tmp != '\0'
1240
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1241
argp_error(state, "Bad number of DH bits");
1242
}
1243
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1244
break;
1245
case 130: /* --priority */
1246
mc.priority = arg;
1247
break;
1248
case 131: /* --delay */
1249
errno = 0;
1250
delay = strtof(arg, &tmp);
1251
if(errno != 0 or tmp == arg or *tmp != '\0'){
1252
argp_error(state, "Bad delay");
1253
}
1254
break;
1255
/*
1256
* These reproduce what we would get without ARGP_NO_HELP
1257
*/
1258
case '?': /* --help */
1259
argp_state_help(state, state->out_stream,
1260
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1261
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1262
case -3: /* --usage */
1263
argp_state_help(state, state->out_stream,
1264
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1265
case 'V': /* --version */
1266
fprintf(state->out_stream, "%s\n", argp_program_version);
1267
exit(argp_err_exit_status);
1268
break;
1269
default:
1270
return ARGP_ERR_UNKNOWN;
1271
}
1272
return errno;
1273
}
1274
1275
struct argp argp = { .options = options, .parser = parse_opt,
1276
.args_doc = "",
1277
.doc = "Mandos client -- Get and decrypt"
1278
" passwords from a Mandos server" };
1279
ret = argp_parse(&argp, argc, argv,
1280
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1281
switch(ret){
1282
case 0:
1283
break;
1284
case ENOMEM:
1285
default:
1286
errno = ret;
1287
perror("argp_parse");
1288
exitcode = EX_OSERR;
1289
goto end;
1290
case EINVAL:
1291
exitcode = EX_USAGE;
1292
goto end;
1293
}
1294
}
1295
1296
if(not debug){
1297
avahi_set_log_function(empty_log);
1298
}
1299
1300
if(interface[0] == '\0'){
1301
struct dirent **direntries;
1302
ret = scandir(sys_class_net, &direntries, good_interface,
1303
alphasort);
1304
if(ret >= 1){
1305
/* Pick the first good interface */
1306
interface = strdup(direntries[0]->d_name);
1307
if(debug){
1308
fprintf(stderr, "Using interface \"%s\"\n", interface);
1309
}
1310
if(interface == NULL){
1311
perror("malloc");
1312
free(direntries);
1313
exitcode = EXIT_FAILURE;
1314
goto end;
1315
}
1316
free(direntries);
1317
} else {
1318
free(direntries);
1319
fprintf(stderr, "Could not find a network interface\n");
1320
exitcode = EXIT_FAILURE;
1321
goto end;
1322
}
1323
}
1324
1325
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1326
from the signal handler */
1327
/* Initialize the pseudo-RNG for Avahi */
1328
srand((unsigned int) time(NULL));
1329
mc.simple_poll = avahi_simple_poll_new();
1330
if(mc.simple_poll == NULL){
1331
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1332
exitcode = EX_UNAVAILABLE;
1333
goto end;
1334
}
1335
1336
sigemptyset(&sigterm_action.sa_mask);
1337
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1338
if(ret == -1){
1339
perror("sigaddset");
1340
exitcode = EX_OSERR;
1341
goto end;
1342
}
1343
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1344
if(ret == -1){
1345
perror("sigaddset");
1346
exitcode = EX_OSERR;
1347
goto end;
1348
}
1349
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1350
if(ret == -1){
1351
perror("sigaddset");
1352
exitcode = EX_OSERR;
1353
goto end;
1354
}
1355
/* Need to check if the handler is SIG_IGN before handling:
1356
| [[info:libc:Initial Signal Actions]] |
1357
| [[info:libc:Basic Signal Handling]] |
1358
*/
1359
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1360
if(ret == -1){
1361
perror("sigaction");
1362
return EX_OSERR;
1363
}
1364
if(old_sigterm_action.sa_handler != SIG_IGN){
1365
ret = sigaction(SIGINT, &sigterm_action, NULL);
1366
if(ret == -1){
1367
perror("sigaction");
1368
exitcode = EX_OSERR;
1369
goto end;
1370
}
1371
}
1372
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1373
if(ret == -1){
1374
perror("sigaction");
1375
return EX_OSERR;
1376
}
1377
if(old_sigterm_action.sa_handler != SIG_IGN){
1378
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1379
if(ret == -1){
1380
perror("sigaction");
1381
exitcode = EX_OSERR;
1382
goto end;
1383
}
1384
}
1385
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1386
if(ret == -1){
1387
perror("sigaction");
1388
return EX_OSERR;
1389
}
1390
if(old_sigterm_action.sa_handler != SIG_IGN){
1391
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1392
if(ret == -1){
1393
perror("sigaction");
1394
exitcode = EX_OSERR;
1395
goto end;
1396
}
1397
}
1398
1399
/* If the interface is down, bring it up */
1400
if(strcmp(interface, "none") != 0){
986
1401
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
1402
if(if_index == 0){
988
1403
fprintf(stderr, "No such interface: \"%s\"\n", interface);
989
exit(EXIT_FAILURE);
990
}
991
992
if(connect_to != NULL){
993
/* Connect directly, do not use Zeroconf */
994
/* (Mainly meant for debugging) */
995
char *address = strrchr(connect_to, ':');
996
if(address == NULL){
997
fprintf(stderr, "No colon in address\n");
998
exitcode = EXIT_FAILURE;
999
goto end;
1000
}
1001
errno = 0;
1002
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1003
if(errno){
1004
perror("Bad port number");
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
*address = '\0';
1009
address = connect_to;
1010
ret = start_mandos_communication(address, port, if_index, &mc);
1011
if(ret < 0){
1012
exitcode = EXIT_FAILURE;
1013
} else {
1014
exitcode = EXIT_SUCCESS;
1015
}
1016
goto end;
1017
}
1018
1019
if (not debug){
1020
avahi_set_log_function(empty_log);
1021
}
1022
1023
/* Initialize the pseudo-RNG for Avahi */
1024
srand((unsigned int) time(NULL));
1025
1026
/* Allocate main Avahi loop object */
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if (mc.simple_poll == NULL) {
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
" object.\n");
1031
exitcode = EXIT_FAILURE;
1032
goto end;
1033
}
1034
1035
{
1036
AvahiServerConfig config;
1037
/* Do not publish any local Zeroconf records */
1038
avahi_server_config_init(&config);
1039
config.publish_hinfo = 0;
1040
config.publish_addresses = 0;
1041
config.publish_workstation = 0;
1042
config.publish_domain = 0;
1043
1044
/* Allocate a new server */
1045
mc.server = avahi_server_new(avahi_simple_poll_get
1046
(mc.simple_poll), &config, NULL,
1047
NULL, &error);
1048
1049
/* Free the Avahi configuration data */
1050
avahi_server_config_free(&config);
1051
}
1052
1053
/* Check if creating the Avahi server object succeeded */
1054
if (mc.server == NULL) {
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
avahi_strerror(error));
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1060
1061
/* Create the Avahi service browser */
1062
sb = avahi_s_service_browser_new(mc.server, if_index,
1063
AVAHI_PROTO_INET6,
1064
"_mandos._tcp", NULL, 0,
1065
browse_callback, &mc);
1066
if (sb == NULL) {
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
exitcode = EXIT_FAILURE;
1070
goto end;
1071
}
1072
1073
/* Run the main loop */
1074
1075
if (debug){
1076
fprintf(stderr, "Starting Avahi loop search\n");
1077
}
1078
1079
avahi_simple_poll_loop(mc.simple_poll);
1080
1404
exitcode = EX_UNAVAILABLE;
1405
goto end;
1406
}
1407
1408
if(quit_now){
1409
goto end;
1410
}
1411
1412
/* Re-raise priviliges */
1413
errno = 0;
1414
ret = seteuid(0);
1415
if(ret == -1){
1416
perror("seteuid");
1417
}
1418
1419
#ifdef __linux__
1420
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1421
messages about the network interface to mess up the prompt */
1422
ret = klogctl(8, NULL, 5);
1423
bool restore_loglevel = true;
1424
if(ret == -1){
1425
restore_loglevel = false;
1426
perror("klogctl");
1427
}
1428
#endif /* __linux__ */
1429
1430
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1431
if(sd < 0){
1432
perror("socket");
1433
exitcode = EX_OSERR;
1434
#ifdef __linux__
1435
if(restore_loglevel){
1436
ret = klogctl(7, NULL, 0);
1437
if(ret == -1){
1438
perror("klogctl");
1439
}
1440
}
1441
#endif /* __linux__ */
1442
/* Lower privileges */
1443
errno = 0;
1444
ret = seteuid(uid);
1445
if(ret == -1){
1446
perror("seteuid");
1447
}
1448
goto end;
1449
}
1450
strcpy(network.ifr_name, interface);
1451
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1452
if(ret == -1){
1453
perror("ioctl SIOCGIFFLAGS");
1454
#ifdef __linux__
1455
if(restore_loglevel){
1456
ret = klogctl(7, NULL, 0);
1457
if(ret == -1){
1458
perror("klogctl");
1459
}
1460
}
1461
#endif /* __linux__ */
1462
exitcode = EX_OSERR;
1463
/* Lower privileges */
1464
errno = 0;
1465
ret = seteuid(uid);
1466
if(ret == -1){
1467
perror("seteuid");
1468
}
1469
goto end;
1470
}
1471
if((network.ifr_flags & IFF_UP) == 0){
1472
network.ifr_flags |= IFF_UP;
1473
take_down_interface = true;
1474
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1475
if(ret == -1){
1476
take_down_interface = false;
1477
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1478
exitcode = EX_OSERR;
1479
#ifdef __linux__
1480
if(restore_loglevel){
1481
ret = klogctl(7, NULL, 0);
1482
if(ret == -1){
1483
perror("klogctl");
1484
}
1485
}
1486
#endif /* __linux__ */
1487
/* Lower privileges */
1488
errno = 0;
1489
ret = seteuid(uid);
1490
if(ret == -1){
1491
perror("seteuid");
1492
}
1493
goto end;
1494
}
1495
}
1496
/* sleep checking until interface is running */
1497
for(int i=0; i < delay * 4; i++){
1498
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1499
if(ret == -1){
1500
perror("ioctl SIOCGIFFLAGS");
1501
} else if(network.ifr_flags & IFF_RUNNING){
1502
break;
1503
}
1504
struct timespec sleeptime = { .tv_nsec = 250000000 };
1505
ret = nanosleep(&sleeptime, NULL);
1506
if(ret == -1 and errno != EINTR){
1507
perror("nanosleep");
1508
}
1509
}
1510
if(not take_down_interface){
1511
/* We won't need the socket anymore */
1512
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1513
if(ret == -1){
1514
perror("close");
1515
}
1516
}
1517
#ifdef __linux__
1518
if(restore_loglevel){
1519
/* Restores kernel loglevel to default */
1520
ret = klogctl(7, NULL, 0);
1521
if(ret == -1){
1522
perror("klogctl");
1523
}
1524
}
1525
#endif /* __linux__ */
1526
/* Lower privileges */
1527
errno = 0;
1528
if(take_down_interface){
1529
/* Lower privileges */
1530
ret = seteuid(uid);
1531
if(ret == -1){
1532
perror("seteuid");
1533
}
1534
} else {
1535
/* Lower privileges permanently */
1536
ret = setuid(uid);
1537
if(ret == -1){
1538
perror("setuid");
1539
}
1540
}
1541
}
1542
1543
if(quit_now){
1544
goto end;
1545
}
1546
1547
ret = init_gnutls_global(pubkey, seckey);
1548
if(ret == -1){
1549
fprintf(stderr, "init_gnutls_global failed\n");
1550
exitcode = EX_UNAVAILABLE;
1551
goto end;
1552
} else {
1553
gnutls_initialized = true;
1554
}
1555
1556
if(quit_now){
1557
goto end;
1558
}
1559
1560
tempdir_created = true;
1561
if(mkdtemp(tempdir) == NULL){
1562
tempdir_created = false;
1563
perror("mkdtemp");
1564
goto end;
1565
}
1566
1567
if(quit_now){
1568
goto end;
1569
}
1570
1571
if(not init_gpgme(pubkey, seckey, tempdir)){
1572
fprintf(stderr, "init_gpgme failed\n");
1573
exitcode = EX_UNAVAILABLE;
1574
goto end;
1575
} else {
1576
gpgme_initialized = true;
1577
}
1578
1579
if(quit_now){
1580
goto end;
1581
}
1582
1583
if(connect_to != NULL){
1584
/* Connect directly, do not use Zeroconf */
1585
/* (Mainly meant for debugging) */
1586
char *address = strrchr(connect_to, ':');
1587
if(address == NULL){
1588
fprintf(stderr, "No colon in address\n");
1589
exitcode = EX_USAGE;
1590
goto end;
1591
}
1592
1593
if(quit_now){
1594
goto end;
1595
}
1596
1597
uint16_t port;
1598
errno = 0;
1599
tmpmax = strtoimax(address+1, &tmp, 10);
1600
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1601
or tmpmax != (uint16_t)tmpmax){
1602
fprintf(stderr, "Bad port number\n");
1603
exitcode = EX_USAGE;
1604
goto end;
1605
}
1606
1607
if(quit_now){
1608
goto end;
1609
}
1610
1611
port = (uint16_t)tmpmax;
1612
*address = '\0';
1613
address = connect_to;
1614
/* Colon in address indicates IPv6 */
1615
int af;
1616
if(strchr(address, ':') != NULL){
1617
af = AF_INET6;
1618
} else {
1619
af = AF_INET;
1620
}
1621
1622
if(quit_now){
1623
goto end;
1624
}
1625
1626
while(not quit_now){
1627
ret = start_mandos_communication(address, port, if_index, af);
1628
if(quit_now or ret == 0){
1629
break;
1630
}
1631
sleep(15);
1632
};
1633
1634
if (not quit_now){
1635
exitcode = EXIT_SUCCESS;
1636
}
1637
1638
goto end;
1639
}
1640
1641
if(quit_now){
1642
goto end;
1643
}
1644
1645
{
1646
AvahiServerConfig config;
1647
/* Do not publish any local Zeroconf records */
1648
avahi_server_config_init(&config);
1649
config.publish_hinfo = 0;
1650
config.publish_addresses = 0;
1651
config.publish_workstation = 0;
1652
config.publish_domain = 0;
1653
1654
/* Allocate a new server */
1655
mc.server = avahi_server_new(avahi_simple_poll_get
1656
(mc.simple_poll), &config, NULL,
1657
NULL, &error);
1658
1659
/* Free the Avahi configuration data */
1660
avahi_server_config_free(&config);
1661
}
1662
1663
/* Check if creating the Avahi server object succeeded */
1664
if(mc.server == NULL){
1665
fprintf(stderr, "Failed to create Avahi server: %s\n",
1666
avahi_strerror(error));
1667
exitcode = EX_UNAVAILABLE;
1668
goto end;
1669
}
1670
1671
if(quit_now){
1672
goto end;
1673
}
1674
1675
/* Create the Avahi service browser */
1676
sb = avahi_s_service_browser_new(mc.server, if_index,
1677
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1678
NULL, 0, browse_callback, NULL);
1679
if(sb == NULL){
1680
fprintf(stderr, "Failed to create service browser: %s\n",
1681
avahi_strerror(avahi_server_errno(mc.server)));
1682
exitcode = EX_UNAVAILABLE;
1683
goto end;
1684
}
1685
1686
if(quit_now){
1687
goto end;
1688
}
1689
1690
/* Run the main loop */
1691
1692
if(debug){
1693
fprintf(stderr, "Starting Avahi loop search\n");
1694
}
1695
1696
avahi_simple_poll_loop(mc.simple_poll);
1697
1081
1698
end:
1082
1083
if (debug){
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1085
}
1086
1087
/* Cleanup things */
1088
if (sb != NULL)
1089
avahi_s_service_browser_free(sb);
1090
1091
if (mc.server != NULL)
1092
avahi_server_free(mc.server);
1093
1094
if (mc.simple_poll != NULL)
1095
avahi_simple_poll_free(mc.simple_poll);
1096
1097
if (gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit ();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1699
1700
if(debug){
1701
fprintf(stderr, "%s exiting\n", argv[0]);
1702
}
1703
1704
/* Cleanup things */
1705
if(sb != NULL)
1706
avahi_s_service_browser_free(sb);
1707
1708
if(mc.server != NULL)
1709
avahi_server_free(mc.server);
1710
1711
if(mc.simple_poll != NULL)
1712
avahi_simple_poll_free(mc.simple_poll);
1713
1714
if(gnutls_initialized){
1715
gnutls_certificate_free_credentials(mc.cred);
1716
gnutls_global_deinit();
1717
gnutls_dh_params_deinit(mc.dh_params);
1718
}
1719
1720
if(gpgme_initialized){
1721
gpgme_release(mc.ctx);
1722
}
1723
1724
/* Take down the network interface */
1725
if(take_down_interface){
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror("seteuid");
1731
}
1732
if(geteuid() == 0){
1733
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1734
if(ret == -1){
1735
perror("ioctl SIOCGIFFLAGS");
1736
} else if(network.ifr_flags & IFF_UP) {
1737
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1738
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1739
if(ret == -1){
1740
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1741
}
1742
}
1743
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1744
if(ret == -1){
1745
perror("close");
1746
}
1747
/* Lower privileges permanently */
1748
errno = 0;
1749
ret = setuid(uid);
1750
if(ret == -1){
1751
perror("setuid");
1752
}
1753
}
1754
}
1755
1756
/* Removes the temp directory used by GPGME */
1757
if(tempdir_created){
1758
DIR *d;
1759
struct dirent *direntry;
1760
d = opendir(tempdir);
1761
if(d == NULL){
1762
if(errno != ENOENT){
1113
1763
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
closedir(d);
1137
}
1138
ret = rmdir(tempdir);
1139
if(ret == -1){
1140
perror("rmdir");
1141
}
1142
}
1143
1144
return exitcode;
1764
}
1765
} else {
1766
while(true){
1767
direntry = readdir(d);
1768
if(direntry == NULL){
1769
break;
1770
}
1771
/* Skip "." and ".." */
1772
if(direntry->d_name[0] == '.'
1773
and (direntry->d_name[1] == '\0'
1774
or (direntry->d_name[1] == '.'
1775
and direntry->d_name[2] == '\0'))){
1776
continue;
1777
}
1778
char *fullname = NULL;
1779
ret = asprintf(&fullname, "%s/%s", tempdir,
1780
direntry->d_name);
1781
if(ret < 0){
1782
perror("asprintf");
1783
continue;
1784
}
1785
ret = remove(fullname);
1786
if(ret == -1){
1787
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1788
strerror(errno));
1789
}
1790
free(fullname);
1791
}
1792
closedir(d);
1793
}
1794
ret = rmdir(tempdir);
1795
if(ret == -1 and errno != ENOENT){
1796
perror("rmdir");
1797
}
1798
}
1799
1800
if(quit_now){
1801
sigemptyset(&old_sigterm_action.sa_mask);
1802
old_sigterm_action.sa_handler = SIG_DFL;
1803
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1804
&old_sigterm_action,
1805
NULL));
1806
if(ret == -1){
1807
perror("sigaction");
1808
}
1809
do {
1810
ret = raise(signal_received);
1811
} while(ret != 0 and errno == EINTR);
1812
if(ret != 0){
1813
perror("raise");
1814
abort();
1815
}
1816
TEMP_FAILURE_RETRY(pause());
1817
}
1818
1819
return exitcode;
1145
1820
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0